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KMID : 0355219920170010041
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Journal of Korean Academy Oral Medicine
1992 Volume.17 No. 1 p.41 ~ p.50
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THE EFFECT OF MASTICATORY MUSCLEFATIGUE ON THE OCCLUSAL CONTACT STABILITY AND MASTICATORY MUSCLE ACTIVITIELS
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Abstract
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The authors performed an experimental study to evaluate the effects of masticatory muscle fatigue on tooth contact and masticatory muscle activity in 26 normal healthy women.
The experimental masticatory muscle fatigue was induced by unilateral biting of 5kg force on mandibular first molar.
@ES The results were as follows :
@EN 1. The initial symptom related to muscle fatigue pain appeared in 85.19 seconds of isometric contraction and the endurance time of isometric contraction was 203.15 seconds.
2. The pain occured more frequently in masseter region than in temporal region. In masseter pain the incidence was almost equal between both sides, whereas the temporal pain was more in contralateral side.
3. The spontaneity and the symmetry of tooth contact during maximum clenching were reduced after isometric unilateral biting.
4. After iduction of experimental muscle fatigue, the EMG activities of masseter muscles of both sides and ipsilateral temporal muscle showed the tendency of decreasing activities.
5. The asymmetry indicies of masseter and temporal muscles were reduced after isometric unilateral biting.
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